Free training calculators
The same maths Fit PA runs on your watch data, open to everyone. No account needed.
Race Time Predictor
Your predicted finish time from one recent race, with race-day splits and paces — or start from a goal time and see what it takes.
Heart Rate Zone Calculator
Your five training zones from max heart rate, heart rate reserve (Karvonen) or threshold heart rate, and what each zone is for.